package Project;

import java.io.*;

public class Jv_4_5 {
	public static void main(String[] args)   
	   throws java.io.IOException { 
	   int jumsu;
	   char hakjum;
	   String iput;

	   System.out.println("***** result *****");
	   System.out.print("Input jumsu: ");

	   InputStreamReader kkk = new InputStreamReader(System.in);
	   BufferedReader bbb = new BufferedReader(kkk);
	   iput = bbb.readLine();
	   jumsu = Integer.parseInt(iput);
	 
	   switch(jumsu/10)
	     {
	      case 10: hakjum = 'A';
		       break;
	      case 9:  hakjum = 'A';
		       break;
	      case 8:  hakjum = 'B';
		       break;
	      case 7:  hakjum = 'C';
		       break;
	      case 6:  hakjum = 'D';
		       break;
	      default: hakjum = 'F';
		       break;
	     }
	   System.out.println("Hakjum: " + hakjum);
	 }

}
